Existent research of photocatalyst have occupied on improving capacity of photocatalyst and coating. A lot of investment expenses happen for performance elevation and visible ray reactivity elevation of this photocatalyst. In construction system, to graft photocatalyst, it is necessary that doping expensive metal element or complicated processing. So have a lot of controversial points in economical cotton. Also, to apply photocatalyst indoors in construction, there is problem, because photocatalyst can not react on visible-rays, weak than ultraviolet rays strength(380nm). To solve these problem several kind of metal elements doped with various doping method. in this treatise, it used method of heat treatment and made doping photocatalyst to develop visible ray reactivity photocatalyst. First, analyzed degree of removal efficiency of acetaldehyde gas as statistical under visible ray according to doping element, doping temperature, doping ratio of element. Treat with heat each at temperature of $600^{circ}C$, $800^{circ}C$, $1000^{circ}C$ doping 5 metal elements(Cu, Mn, Ni, An,Al) by ratio of each 3%, 6%, 9% and grasped tendency comparing 45 experimental group. These did analysis by kind of element that do doping, doping ratio, doping temperature each item. Also, grasped interrelation between kind of doping element and doping temperature and between kind of doping element and doping ratio and between doping temperature and doping temperature by using tree-way classification.